defsend_message(sender,recipient,message_body,priority=1):"""Send a message to a recipient :param str sender: The person sending the message :param str recipient: The recipient of the message :param str message_body: The body of the message :param priority: The priority of the message, can be a number 1-5 :type priority: integer or None :return: the message id :rtype: int :raises ValueError: if the message_body exceeds 160 characters :raises TypeError: if the message_body is not a basestring """# Function definition